Jet assembly for pumps



Jan. 21, 1958 B. G. SULLIVAN ET AL 2,820,418

JET ASSEMBLY FOR PUMPS Filed April 2, 1954 INVENTOR. Lyman H. Turner Bernard 6. Sullivan deny/Z M Attorney United tates 2,820,418 JET ASSEMBLY FOR PUMPS Bernard G. Sullivan, Macedon, and Lyman H. Turner, Rochester, N. Y., assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application April 2, 1954, Serial No. 4.2d,624 Claims. (Cl. 103260) This invention pertains to a jet assembly for pumps, and

particularly to a simplified jet nozzle construction.

Heretofore, jet assemblies for centrifugal jet pumps have been expensive to manufacture by reason of the fact that the jet assembly, comprising a nozzle and venturi, were made as either an integral casting having a plurality of cored passages or as individual castings which were later assembled. One of the salient features of this invention resides in a simplified and more economical nozzle construction for jet assemblies. Accordingly, among my objects are the provision of a simplified jet assembly for pumps, and the further provision of a jet nozzle assembly adapted for attachment to a coupling so that the nozzle terminates proximate the throat of a venturi.

The aforementioned and other objects are accomplished in the present invention by fabricating a two-piece nozzle assembly and thereafter, assembling the nozzle with a venturi so that the nozzle discharge opening is located proximate the throat of the venturi. Specifically, the nozzle comprises a tubular metal member having open ends and a sidewall opening, and a hollow substantially frusto conical metal member attached thereto adjacent the edges of the sidewall opening. The jet assembly may be used with either a double type arrangement, as disclosed herein, or with a single type arrangement. In either event, the venturi comprises a metal or plastic casting which is threadedly connected with a coupling, the coupling also being threadedly connected at opposite ends to a venturi intake pipe and a venturi discharge pipe. The coupling has a transverse opening therethrough within which the tubular member of the nozzle is disposed. The nozzle is oriented within the coupling so that the sidewall opening in the tubular member and the conical member are coaxially arranged with respect to the venturi.

The jet assembly operates in a conventional manner when associated with a centrifugal pump. Thus, a portion of the fluid is diverted from the pump outlet and discharged through the nozzle into the throat of the venturi. The high velocity of the fluid traversing the throat of the venturi creates suction, which draws additional fluid from a sump, or well, through the venturi intake pipe. In this manner, fluid is drawn from the sump, or well, which fluid traverses the venturi and flows to the pump through the venturi discharge pipe.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 is a view, partly in section and partly in elevation, of the jet assembly of this invention.

Fig. 2 is a sectional view taken along line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken along line 3--3 of Fig. 1.

or diametrically extending assembly 2,820,418 Patented Jan. 21, 1958 ice Fig. 4 is a view, in perspective, of the jet nozzle assembly of this invention.

With particular reference to Figs. 1 through 3, the jet assembly of this invention is depicted generally by the numeral 10, and comprises a venturi 12 and a jet nozzle 14. The venturi is threadedly connected with a coupling 16, the coupling 16 also having threaded connection at opposite ends with a venturi discharge pipe 18 and a venturi intake pipe 20. The coupling member 16 is formed with a transverse, or diametrical, opening 22, which, as disclosed, is enclosed by an adapter 24. The adapter 24 encompasses the section of the coupling 16 having the transverse opening 22, and is retained in position by a nut 26, which threadedly engages an exterior portion of the coupling 16. Suitable gaskets 28 and 30 are employed to prevent leakage of fluid from within the adapter.

The adapter is also connected with a pipe 32 through which a portion of the pump output with which the jet assembly is associated, is diverted. The arrangement depicted in Fig. 1 is known as a two-pipe jet assembly, but it is to be understood that the jet nozzle construction of this invention can also be used with a single pipe arrangement. Moreover, it is to be understood that the pipe 18 will be connected with the intake of a pump, not shown; the pipe 20 will be connected to a sump, or a well, not shown; while the pipe 32 will be connected to one of the pump outlets so that a portion of the pump output is diverted through the jet assembly for drawing fluid from the well through the pipe 20.

With particular reference to Fig. 4, the improved jet nozzle construction of this invention comprises a cylindrical member 34, which may be of sheet metal, having a sidewall opening 36, as shown in Figs. 1 and 3. The jet nozzle construction also includes a substantially frusto conical metal member 38, which may also be of sheet metal, adapted to be suitably secured to the member 34 adjacent the peripheral edges of the sidewall opening 36 by any suitable means, such as by welding.

The jet assembly is made as follows. Initially, the tubular member 34 is inserted in the transverse opening 22 of the coupling 16, after which it is secured in place by any suitable means, such as by welding. Thereafter, the nozzle element 38 is connected to the peripheral edges of the sidewall opening 36 so that the outlet thereof is coaxially arranged within the coupling 16. Thereafter, the venturi 12 is threadedly connected with the coupling 16, after which the adapter 24 and the pipes 18, 20 and 32 may be assembled with the jet assembly.

In operation, water is diverted from the pump outlet, not shown, through the pipe 32 to the adapter 24 from which it passes through the tubular member 34 and discharges through the nozzle element 38 proximate the throat 40 of the venturi 12. The discharge of fluid under high velocity into the throat 40 of the venturi, creates a suction effect, which draws fluid from the sump, or well, not shown, through the intake pipe 20, the coupling 16, and discharges the same through the venturi 12 to the pipe 18 from which it is drawn to the pump intake.

From the aforegoing, it is apparent that the present invention provides an exceedingly simplified jet construction which is economical to manufacture and assemble with a venturi.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted.

What is claimed is as follows:

1. A jet assembly including, a coupling adapted for connection to a venturi intake pipe and a venturi discharge pipe, a venturi attached to and coaxially disposed within said coupling, said coupling having a transverse opening thereth'rough, a nozzle assembly supported by said coupling and coaxially arranged with respect to said venturi, said nozzle assembly comprising a tubular member supported in the transverse opening of said coupling and having a sidewall opening, and a second member having a substantially frusto conical passage thercthrc municating with the sidewall opening of said tubular member, the outlet of said second member termina proximate the throat of said venturi, and a hollow ad attached to said coupling, said adapter c said coupling and communicating with member.

2. A jet assembly including in combinatn coupling adapted for connection to a venturi int 4e pipe and a venturi discharge pipe, a venturi attac coaxially disposed within said coupling, having a transverse opening therethrough, assembly supported by said coupling comprising, 2. hollow member disposed in the transverse open having a sidewall opening, and a second member attached to said first member and having a substan' ly frusto conical passage therethrough communicatin the side wall opening of said tubular member, said second member terminating proximate the throat of said venturi, and a hollow adapter attached to said coupling and enclosing the transverse opening therein.

3. A jet assembly including in combinati coupling adapted for connection to a venturr inta.-.e p and a venturi discharge pipe, a venturi attached to coaxially disposed within said coupling, sat. coupling having a transverse opening therethrough, a jet nozzle assembly supported by said coupling comprising, a hollow cylindrical member supported in the transverse opening of said coupling and having a sidewall opening, and a second member attached to said cylindrical member adjacent the peripheral edges or" said sidewall opening and having a substantially frusto conical passage ther 1 i, a hollow let u through, the end of said second member terminating proximate the throat of said venturi, a hollow adapter attached to said coupling, said adapter encompassing said coupling and communicating with said hollow cylindrical member, and a pressure pipe connected to said hollow adapter.

4. A jet assembly including in combination, a hollow coupling adapted for connection to a venturi intake pipe and a venturi discharge pipe, a venturi attached to and coaxially disposed within said coupling, said coupling having a transverse opening therethrough, a jet nozzle assembly supported by said coupling comprising, a tubular metal member having a sidewall opening, the ends of d metal member being received in and supported by tr is opening in said coupling, and a hollow, substantially frusto conical metal member attached to said cylindrical member adjacent the peripheral edges of said sidewall opening, said frusto conical member termi- 'mate the throat of said venturi and a hollow cited to said coupling and enclosing the transse ope Q .erein 5. A et assembly including in combination, a coupling havirw a diametrical o enim therethrou h, a hollow References Cited in the file of this patent UNITED STATES PATENTS 712,835 Moran Nov. 4, 1902 1,0l7,533 Goodlett Feb. 13, 1912 1,762,313 Snow June 10, 1930 2,314,525 Summers Mar. 23, 1943 2,347,149 Chirgwin Apr. 18, 1944 2,489,636 Gurley Nov. 29, 1949 2,533,028 McConaghy Dec. 5, 1950 2,674,202 Kelley Apr. 6, 1954 

